fix: main red, llms.txt H1 wrongly capitalized by #855 brand fix

[vivek7405]

Problem

main is red. The brand-casing one-time fix in #855 capitalized the llms.txt index H1 in docs/lib/llms.server.ts from # webjs documentation to # WebJs documentation (lines ~347 and ~384, plus the JSDoc at ~338). But test/docs/llms.test.mjs:55 asserts /^# webjs documentation/ and docs/AGENTS.md:54 documents the H1 as the lowercase # webjs documentation. The one-time fix over-reached into a generated-file identifier that is pinned by a test and a doc contract.

The failing check was present on #855 (the "Unit + integration" job failed) and was bypassed by an --admin merge, so it landed on main.

Design / approach

Revert the llms.txt index H1 to the documented lowercase # webjs documentation (index and full-corpus), restoring the test + docs/AGENTS.md contract. The per-page blurbs in the llms output stay brand-cased (they are page descriptions, not the pinned H1, and no test asserts them). This is the minimal, contract-honoring fix. Capitalizing the H1 as a deliberate brand change would instead require updating the test and the AGENTS.md spec together, out of scope for a red-main hotfix.

Implementation notes (for the implementing agent)

• Edit docs/lib/llms.server.ts: the two push('# WebJs documentation'...) calls (index around L347, full-corpus around L384) back to lowercase webjs, and the JSDoc comment around L338.
• Verify: node --test test/docs/llms.test.mjs (the GET /llms.txt H1 test must pass; the corpus test at L106 checks no webjs build command, already lowercase, keep it).
• Landmine: docs/lib/llms.server.ts is flagged binary by git (pre-existing non-ASCII doc content, not corruption). Edit with a UTF-8-safe tool.
• Process landmine that caused this: do NOT --admin-merge past a FAILING check. --admin bypasses failing checks, not just the review gate. Re-verify gh pr checks is green immediately before any admin merge.

Acceptance criteria

• llms.txt index and full-corpus H1 emit # webjs documentation again
• node --test test/docs/llms.test.mjs passes
• main CI green

[vivek7405]

Correction on approach: the source (docs/lib/llms.server.ts) emitting # WebJs documentation is CORRECT per the brand rule. The real defect is that #855 left the test (test/docs/llms.test.mjs:55) and docs/AGENTS.md pinning the old lowercase form. Fix is to update those to WebJs, NOT revert the source.